Raw vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). EPSS scores by FIRST (EPSS SIG), generated by Empirical Security. Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2026-27646 is a medium-severity Incorrect Authorization (CWE-863) vulnerability in Openclaw. Its CVSS base score is 5.8 (Medium).
Operationally, ranked at the 1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified map to AC-24 (Access Control Decisions) and AC-25 (Reference Monitor) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
OpenClaw versions prior to 2026.3.7 are affected by CVE-2026-27646, a sandbox escape vulnerability in the /acp spawn command. This flaw allows authorized sandboxed sessions to initialize host-side ACP runtime when ACP is enabled, enabling attackers to bypass sandbox restrictions by invoking the /acp spawn slash-command to transition from a sandboxed chat context into host-side ACP session initialization. The vulnerability is associated with CWE-863 (Incorrect Authorization) and carries a CVSS v3.1 base score of 6.1 (AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N), indicating medium severity with local access requirements, low complexity, and low privileges needed.
An attacker with low privileges (PR:L) in an authorized sandboxed session can exploit this vulnerability locally without user interaction. By issuing the /acp spawn command, they achieve a sandbox escape, gaining the ability to initialize host-side ACP runtime. This results in low impact to confidentiality (C:L), high impact to integrity (I:H) through unauthorized execution outside the sandbox, and no impact to availability (A:N), potentially allowing further compromise of the host environment.
Mitigation is addressed in OpenClaw version 2026.3.7 and later, as evidenced by the referenced GitHub commit (61000b8e4ded919ca1a825d4700db4cb3fdc56e3) that likely implements the fix. Security advisories from GitHub (GHSA-9q36-67vc-rrwg) and Vulncheck provide additional details on the issue and recommend updating to patched versions to prevent exploitation.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-14557
Vulnerability Data
OpenClaw versions prior to 2026.3.7 contain a sandbox escape vulnerability in the /acp spawn command that allows authorized sandboxed sessions to initialize host-side ACP runtime. Attackers can bypass sandbox restrictions by invoking the /acp spawn slash-command to cross from sandboxed…
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chat context into host-side ACP session initialization when ACP is enabled.
- CWE(s)
Related Threats
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
AC-3 directly requires correct enforcement of authorization decisions on every access request, structurally preventing incorrect checks.
AC-24 ensures access-control decisions are made and applied consistently, reducing the chance of an incorrect authorization result.
A reference monitor that is always invoked and tamper-proof forces every authorization decision through a verified, correct path.
Least-privilege assignments shrink the set of authorizations that must be checked correctly, limiting exposure to flawed checks.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
A.5.18's provisioning, revocation, review and adjustment of access rights (incl. before role changes/termination, with segregation and owner approval) directly stops incorrect authorization decisions from being exploitable in the vast majority of cases; the bounded remainder is incorrectness inside the authorization logic itself (e.g. flawed conditional or missing check) rather than rights that were wrongly granted.
A.8.3 directly mandates restricting access to information per policies via configuration, identity/group controls, isolation, and dynamic techniques that enforce correct authorization decisions, addressing most but not all slices of CWE-863 (e.g., remainder in non-access-decision authorization errors like timing or environmental factors).
Requiring consistency between access rights and classification plus formal approval steps ensures that the authorization logic correctly distinguishes between entities that should and should not be granted access.
Hardening callouts derived
DISA STIG baselines are authored against specific weaknesses. Where this CVE cites a broad weakness class, the mapping is not asserted at that abstraction (owner ruling, 2026-09-25: grade only at Base and below), so no rule is shown here rather than a rule shown against the wrong grain.
- No fine-grained STIG row for CWE-863, a class-level weakness, and none of its children carries one either.